What is VLAN in Cybersecurity?
Networking & InfrastructureVLAN
Version 1.0 · Published April 2026 · Last verified April 2026
How is it pronounced?
VEE-lan/ˈviː.læn/
Two syllables; not 'V-L-A-N'.
A Virtual Local Area Network logically segments a physical network into separate broadcast domains without requiring separate physical switches. VLANs group devices by function, department, or security level, and traffic between VLANs must pass through a router or layer-3 switch that enforces access rules.
Why VLAN Matters for Your Cybersecurity Career
VLANs are a primary tool for network segmentation in cybersecurity. Security engineers use VLANs to isolate sensitive systems like payment processing or medical devices from general office traffic. VLAN hopping attacks are a known threat, so proper trunk port configuration and native VLAN settings matter.
Which Cybersecurity Roles Use VLAN?
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Looking for the acronym? Read about VLAN in the cybersecurity acronym decoder
A Virtual Local Area Network logically segments a physical network into separate broadcast domains without requiring separate physical switches. VLANs group devices by function, department, or security level, and traffic between VLANs must pass through a router or layer-3 switch that enforces access rules.
VLANs are a primary tool for network segmentation in cybersecurity. Security engineers use VLANs to isolate sensitive systems like payment processing or medical devices from general office traffic. VLAN hopping attacks are a known threat, so proper trunk port configuration and native VLAN settings matter.
Cybersecurity professionals who work with VLAN include Security Engineer, Security Architect, SOC Analyst. These roles apply VLAN knowledge within the Networking & Infrastructure domain.
Sources
Definitions are original explanations written for career development purposes. For authoritative technical definitions, refer to NIST, ISO, or the relevant standards body.
Last verified: April 2026?Report an inaccuracy
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